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A study of ZnGa2O4 phosphor prepared by the solid method.
- Source :
- Journal of Materials Science: Materials in Electronics; Aug1998, Vol. 9 Issue 4, p283-288, 6p
- Publication Year :
- 1998
-
Abstract
- In this study, the mixtures of ZnO and Ga2O3 powder with addition of LiCl flux were fired, the raw material mixing ratio, doping with Mn2+ and firing atmosphere effects on phosphor characteristics were investigated. When fired at 1200 °C, its phosphor powder emits a broad-band spectrum range between 375 nm to 700 nm, with a peak at 470 nm. The optimal composition of phosphors is about ZnO/Ga2O5=47/53. Manganese-doped ZnGa2O4, fired in air, exhibits two new emission bands with peaks at 506 nm (Mn2+ emission centre) and 666 nm (Mn4+ emission centre). However, if fired under vacuum, the emission spectrum presents only the 506 nm peak with increased intensity. The 666 nm emission peak derived from a little Mn2 oxidized to Mn4+ which substituted Ga3+ to occupy the B sites of the spinel structure. The emission intensity of the 506 nm peak of Zn1-xMnxGa2O4 is strongest when [Mn2+] x=0.006 and decreases markedly as the concentration of Mn2+ exceeds x=0.01. Most of the substitutional Mn2+ doping species in spinel ZnGa2O4 occupy the zinc sites. The luminescent band was associated to the spin-forbidden transition, 4T1(4G)→6A1 (6S). © 1998 Kluwer Academic Publishers [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 09574522
- Volume :
- 9
- Issue :
- 4
- Database :
- Complementary Index
- Journal :
- Journal of Materials Science: Materials in Electronics
- Publication Type :
- Academic Journal
- Accession number :
- 50043479
- Full Text :
- https://doi.org/10.1023/A:1008824706106